Matt Harris
Registered User
Hello all my 7.3l 2wd F250 E4OD is having some issues. I know big surprise lol. Trans seems like maybe it is in limp mode. When put in drive it is stuck in what feels like 3rd or 4th, takes off in that gear and does not shift out of it. If I move the shifter to 2nd or 1st it will shift into what feels like 2nd gear. So basically I can shift manually between what I think is 2nd and 4th gear. Reverse and neutral functions normally. My O/D off button does not work and the O/D light on the dash does not work/does not do anything/doesn’t flash. My tachometer is stuck at 250 rpm. I learned through searches that tach signal is needed for E4OD to operate correctly. So I looked into it and tach sensor is good. (2500 ohms resistance through terminals, also puts out constant .5 AC volts at idle, which steadily increases with engine rpm) After verifying sensor is good I pulled the gauge cluster and measured voltage between the tachometer’s ground and signal terminals, it is a constant 2.6v DC regardless of engine rpm, it does not change regardless of engine RPM. So something is not right here. From there I disconnected the TECA (tcm) connector and checked to see if tach signal was there. Had same AC voltage reading as tach sensor did, so signal from tach sensor is getting to the TECA. Also checked all grounds in the TECA connector (good) and checked it was getting power through the power wires (good). So the TECA is getting all power/ground/signal it needs to make the tach work. ALSO when I hook up my obd1 ford scanner to my obd connectors under the hood, the scanner will act like it is not even connected to anything, as if I hadn’t even plugged it in. This is Very odd and makes me suspect TECA is failed internally.
so to recap TECA is getting good ground, power, and tach signal but tach still sits at 250 rpm. (again voltage to tach terminals on back of cluster is not changing)
Yes all my fuses and relays are good. I am suspecting a bad TECA (tcm). What are all your thoughts? What should I check to be double sure that the TECA is toast? Should I go to the connectors on the trans and check for any voltages/signals to see if they are correct? NOTE: this truck just sat for 12 years and I was told everything worked fine when it was parked. Thank you from Washington’s state.
so to recap TECA is getting good ground, power, and tach signal but tach still sits at 250 rpm. (again voltage to tach terminals on back of cluster is not changing)
Yes all my fuses and relays are good. I am suspecting a bad TECA (tcm). What are all your thoughts? What should I check to be double sure that the TECA is toast? Should I go to the connectors on the trans and check for any voltages/signals to see if they are correct? NOTE: this truck just sat for 12 years and I was told everything worked fine when it was parked. Thank you from Washington’s state.